You have \$20dollar sign, 20 to spend on taxi fare. The ride costs \$5dollar sign, 5 plus $2.50dollar sign, 2, point, 50 per kilometer.

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho